CVE-2026-98678 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should verify and apply patches to prevent potential issues. The vulnerability can lead to undefined behavior if not patched. The issue affects Linux kernel iio: adc: ad4030 driver.

Why it matters

The Linux kernel iio: adc: ad4030 driver vulnerability can lead to undefined behavior if not patched. Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should verify and apply patches to prevent potential issues.

• Verify patch application to prevent undefined behavior
• Monitor system performance for anomalies
• Review system logs for potential exploitation attempts

Technical summary

The Linux kernel iio: adc: ad4030 driver has a vulnerability where an invalid oversampling_ratio validation can lead to an undefined result from ilog2(). The issue has been resolved by validating that the input is strictly positive prior to computing its logarithm. This vulnerability can lead to undefined behavior if not patched. Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should verify and apply patches to prevent potential issues. The patch notes indicate that passing zero or negative values leads to an undefined result from ilog2().

Defensive priority

Verify and apply patches for the Linux kernel iio: adc: ad4030 driver to prevent potential undefined behavior.

Recommended defensive actions

• Verify and apply patches for the Linux kernel iio: adc: ad4030 driver
• Review system logs for potential exploitation attempts
• Monitor system performance for anomalies
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. The Linux kernel patch notes indicate that the issue has been resolved by validating that the input is strictly positive prior to computing its logarithm. The patch notes also mention that passing zero or negative values leads to an undefined result from ilog2().

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.